| 1 | active galactic nucleus | AGN | 195 | 18 | 2.001484 | 9802234,9802177,etc |
| 2 | initial mass function | IMF | 189 | 14 | 1.005599 | 9802248,9802186,etc |
| 3 | interstellar medium | ISM | 196 | 12 | 2.002697 | 9802125,9802172,etc |
| 4 | gamma ray burst | GRB | 528 | 11 | 2.009189 | 9802125,9802157,etc |
| 5 | hubble space telescope | HST | 65 | 10 | 2.000437 | 9802248,9802246,etc |
| 6 | low mass x ray binary | LMXB | 37 | 9 | 1.001023 | 9802098,9802065,etc |
| 7 | spectral energy distribution | SED | 60 | 7 | 1.000782 | 9802248,9802037,etc |
| 8 | intracluster medium | ICM | 71 | 7 | 2.005419 | 9802172,9802218,etc |
| 9 | large magellanic cloud | LMC | 135 | 7 | 1.001514 | 9802003,9802117,etc |
| 10 | cosmic microwave background | CMB | 88 | 7 | 1.00743 | 9802123,9802135,etc |
| 11 | cold dark matter | CDM | 35 | 6 | 1.000584 | 9802311,9802240,etc |
| 12 | proportional counter array | PCA | 47 | 6 | 1.001096 | 9802065,9802053,etc |
| 13 | nasa/ipac extragalactic database | NED | 7 | 6 | 1.000068 | 9802342,9802058,etc |
| 14 | star formation rate | SFR | 12 | 5 | 1.000512 | 9802248,9802036,etc |
| 15 | broad line region | BLR | 34 | 5 | 1.00076 | 9802244,9802104,etc |
| 16 | narrow line region | NLR | 43 | 5 | 2.00269 | 9802244,9802152,etc |
| 17 | supernova remnant | SNR | 113 | 5 | 1.002446 | 9802361,9802342,etc |
| 18 | supernova | SN | 141 | 5 | 2.007215 | 9802172,9802296,etc |
| 19 | globular cluster | GC | 152 | 5 | 2.008415 | 9802307,9802100,etc |
| 20 | quasi periodic oscillation | QPO | 180 | 5 | 2.007348 | 9802065,9802348,etc |
| 21 | point spread function | PSF | 43 | 5 | 2.001161 | 9802117,9802156,etc |
| 22 | luminosity function | LF | 42 | 4 | 2.001023 | 9802248,9802292,etc |
| 23 | red giant branch | RGB | 55 | 4 | 2.002352 | 9802186,9802075,etc |
| 24 | cataclysmic variable | CV | 62 | 4 | 1.001626 | 9802177,9802138,etc |
| 25 | equation of state | EOS | 51 | 4 | 2.002405 | 9802177,9802312,etc |
| 26 | field of view | FOV | 13 | 4 | 1.001259 | 9802098,9802359,etc |
| 27 | main sequence | MS | 46 | 4 | 2.00101 | 9802141,9802075,etc |
| 28 | hubble deep field | HDF | 128 | 4 | 2.003548 | 9802340,9802327,etc |
| 29 | white dwarf | WD | 302 | 4 | 2.009172 | 9802356,9802120,etc |
| 30 | color magnitude diagram | CMD | 25 | 4 | 1.000916 | 9802117,9802184,etc |
| 31 | burst and transient source experiment | BATSE | 69 | 4 | 1.003343 | 9802324,9802154,etc |
| 32 | all sky monitor | ASM | 27 | 4 | 1.001131 | 9802324,9802222,etc |
| 33 | high resolution imager | HRI | 32 | 4 | 1.002624 | 9802342,9802101,etc |
| 34 | dark matter | DM | 32 | 3 | 2.003293 | 9802142,9802140,etc |
| 35 | black hole | BH | 27 | 3 | 1.000846 | 9802244,9802188,etc |
| 36 | intergalactic medium | IGM | 70 | 3 | 2.001014 | 9802246,9802340,etc |
| 37 | small magellanic cloud | SMC | 150 | 3 | 2.005496 | 9802003,9802058,etc |
| 38 | ultraviolet | UV | 112 | 3 | 2.002977 | 9802003,9802037,etc |
| 39 | very large array | VLA | 37 | 3 | 2.000985 | 9802296,9802148,etc |
| 40 | gamma ray burst monitor | GRBM | 27 | 3 | 1.001706 | 9802157,9802341,etc |
| 41 | target of opportunity | TOO | 18 | 3 | 1.000673 | 9802157,9802078,etc |
| 42 | wide field cameras | WFC | 8 | 3 | 1.000964 | 9802098,9802078,etc |
| 43 | three dimensional | 3D | 13 | 3 | 1.000497 | 9802235,9802004,etc |
| 44 | cosmic background radiation | CBR | 5 | 3 | 1.000474 | 9802021,9802209,etc |
| 45 | asymptotic giant branch | AGB | 40 | 3 | 2.001461 | 9802141,9802137,etc |
| 46 | infrared space observatory | ISO | 15 | 3 | 1.000929 | 9802176,9802346,etc |
| 47 | orion nebula cluster | ONC | 30 | 3 | 2.000512 | 9802306,9802313,etc |
| 48 | william herschel telescope | WHT | 12 | 3 | 2.000798 | 9802213,9802086,etc |
| 49 | neutron star | NS | 53 | 3 | 1.001901 | 9802044,9802038,etc |
| 50 | optical transient | OT | 20 | 3 | 2.001022 | 9802222,9802160,etc |